diff --git a/src/test/codegen/extern-functions.rs b/src/test/codegen/extern-functions.rs
index ff9d54e67e47..7ee31070b263 100644
--- a/src/test/codegen/extern-functions.rs
+++ b/src/test/codegen/extern-functions.rs
@@ -22,3 +22,8 @@ extern {
     #[unwind]
     fn unwinding_extern_fn();
 }
+
+pub unsafe fn force_declare() {
+    extern_fn();
+    unwinding_extern_fn();
+}